Reciprocating bed metal drawing press



Feb. 2, 1960 DANLY ETAL RECIPROCATING BED METAL DRAWING PRESS Filed June21, 1955 5 Sheets-Sheet l 22 i {20 I15 I02 /0 w m m w.

3,3 ILO /SD WLY VHS/L Geo/e FF ATTORNEY Feb. 2, 19.60 P. H. DANLY ETAL2,923,263

RECIPROCATING BED METAL DRAWING PRESS Filed June 21, 1955 5 Sheets-Sheet2 so 66 w i 9 a a4 3 /79 I 4 INVENTORS 8O {77 76 82 PH/Lo 1 DFM/L Vns/LGEO/26E F 0 BY LSILJM Feb. 2, 1960 P. H. DANLY ErAL RECIPROCATING BEDMETAL DRAWING PRESS 5 Sheets-Sheet 3 Filed June 21, 1955 ex 00w w wo\ miN NHG M omx H6 M 4, m 5 H Pi H. DANLY EI'AL RECIPROCATING BED METALDRAWING PRESS Feb. 2, 1960 Filed June 21,' 1955 5' Sheets-Sheet 4 I I Ir I 7 HTTOENEY Feb. 2, 1960 P. H. DANLY ETAL 2,923,263

RECIPROCATING BED METAL DRAWING PRESS Filed June 21, 1955 5 Sheets-Sheet5 IN VEN TORS PH/LO H. DHNLY BY VHS/L 650250-7 RECIPROCATING BED METALDRAWING PRESS Philo H. Danly, Hinsdale, and Vasil Georgetr, La GrangePark, Ill., assignors to Danly Machine Specialties, Inc., Chicago, 111.,a corporation of Illinois Application June 21, 1955, Serial No. 516,934

3 Claims. (Cl. 113-38) Our invention relates to a power press and moreparticularly to a reciprocating bed metal drawing press which operatesat a high speed.

In integrated production lines in which operations are generallyperformed in correlated phases, high speed power presses are necessaryif full advantage is to be taken of the potential production capacity ofthe line. High speed operation of a power press must be-achieved withoutexceeding the permissible draw speed for the material being worked on.In other words, the slide .must not be driven at a speed which wouldresult in tearing of the metal being worked. Further, it is desirable inpower press operation that the draw stroke start at a relatively slowspeed to reduce the tendency of the metal to tear. Once the drawingoperation has .begun, the draw speedmay be increased without deleteriouseffects. v In presses of the prior art in which the press blank holderand draw slide are independently carried on the frame, the length ofstroke required for the draw slide .together with the restriction onpermissible draw speed limit the number of strokes per minute at whichthe press operates. Then too, in this type press the speed at which thedraw slide operates must be regulated to a low value at the point atwhich the drawing operation ycommences.

One suggested solution to the problem of providing a high speed presswithout exceeding the limiting draw speed is to mount the inner slideand one or two drives on a reciprocating crown which carries the blankholder. This construction permits higher speed operation than theconstruction in which the blank holder, separate from the crown, andslide are independently carried on the frame. is, however, limited bythe weight of the crown and structure supported on it. It has also beenproposed to use an inverted draw in which the draw slide is mounted forreciprocation .within the press bed below the reciprocating blankholder. In operation of this type press the blank holder moves down toclamp the work against the bed and the draw slide moves up to draw thework. This construction has .two major disadvantages. Foreign mattersuch as dirt, shavings, fins and metal scraps fall by gravity into the.die carried by the draw slide. It will be appreciated ;that thisforeign matter prevents formation of a satisfactory piece of work. Asheet of metal upon which a drawing operation is to be performed bowsowing to its inherent flexibility. In a press employing an inverteddraw, the work presents its convex side to the draw slide die. Drawingin this manner may produce an unsatisfactory result, sincethe' convexitymust be worked out of the sheet before the desired draw is commenced. Itwill be appreciated that a more efiicient operation results when thedraw slide engages the concave side of the work when the bow of the workis in the direction of the draw.

We have now invented a reciprocating bed power press The speed at whichthis type press may be driven "stem iwltich operates athigh speed. v Thespeed at which our press operates permits full advantage to be taken ofthe potential productive capacity of an integrated production line. Thedraw slide die of our press faces downwardly so that foreign mattercannot fall by gravity into the die carried by the slide. Thearrangement of our press is such that the draw slide engages the concaveside of a sheet of metal being worked on after the sheet has beenclamped between the press bed and the blank holder. The blank holder ofour press is stationary so that no reciprocation of a heavy crownincluding the blank holder, slide and drive means is necessary. Ourreciprocating bed press operates at high speed to increase productionwhile decreasing the labor cost of the articles produced thereby.

One object of our invention is to provide a reciprocating bed powerpress which operates at high speed.

Another object of our invention is to provide a reciprocating bed powerpress which may be used in an integrated production line to permit fulladvantage to be. taken of the productive capacity of the line.

A further object of our invention is to provide a re ciprocating bedpower press which operates at high speed! without the necessity ofreciprocating a heavy crown.

Other and further objects of our invention will appear from thefollowing description.

In general our invention contemplates the provision of a power pressincluding a stationary blank holder carried by the press frame and a bedmounted for reciprocation with respect to the frame for cooperation withthe blank holder. Drive means moves the bed to clamp work fed to thepress between the bed and the blank holder. We slidably mount a drawslide for reciprocating movement within the blank holder. Slide drivemeans synchronized with the bed drive moves the slide to perform adrawing operation on the work clamped between the bed and the blankholder. We provide means for adjusting the position of the blank holderon the frame and means for adjusting the position of the draw slide onthe frame.

In the accompanying drawings which form part of the instantspecification and which are to be read in conjunc-- tion therewith andin which like reference numerals are. used to indicate like parts in thevarious views:

Figure 1 is a sectional front elevation, with some parts: removed andother parts broken away, of one form of; our reciprocating bed pressshowing the general arrangement of parts.

Figure 2 is a sectional side elevation, taken along the line 22 ofFigure 1, of our reciprocating bed press.

Figure 3 is a sectional view, drawn on an enlarged scale, taken alongthe line 3-3 of Figure 1, of our reciprocating bed press.

Figure 4 is a fragmentary sectional view, drawn on an enlarged scale,taken along the line 44 of Figure l, of our reciprocating bed press,showing the stroke adjusting means.

Figure 5 is a schematic view showing the relative positions of the pressparts at various points during a cycle .of operation of ourreciprocating bed press.

.the frame 10 provide a two-point suspension for the blank holder 12within the press frame. We fix one end of each of the rods 14 within oneof a pair of cylindrical mounting supports -16. each carried by a pair'ofbrackets just described for codriving the bed 48.

18 and 20 fixed to the press frame by any convenient means such aswelding or the like. Nuts 22 and 24 retain rods 14 in their respectivesupports 16. The end of each of the rods 14 remote from a support 16 isthreaded and passes into a worm housing 26 supported on the blank holder12 'by a cylindrical support 28. A drive motor 39 carried by the blankholder drives shafts 32 through a gear box 34. Shafts 32 drive the worms(not shown) within the respective housings 26 associated with the rods14. From the structure thus far described it will be appreciated thatthe position of blank holder 12 on the press frame may readily beadjusted .by energizing motor 36 to move the blank holder 12 up or downalong rods 14. In the course of operation of our press after adjustment,blank holder 12 is stationary.

We mount an inner or draw slide 38 within blank holder 12 forreciprocation with respect to the blank holder and frame on suitablebearing surfaces such as gibs or the like. A pair of counterbalancecylinders 40 .and 42 carried by frame 11) support the weight of innerslide 38 from the frame. Each of the cylinders 40 and 42 includes arespective piston rod 44 secured to a bracket 46 on the inner slide.

We mount the bed 48 of our press for reciprocation with respect to thepress frame. A pair of counterbalance cylinders 58 and 52 carried byrespective brackets 54 and 56 secured to the press frame support theweight of bed 48. Respective arms 58 and 60 secure the rods associatedwith cylinders 51 and 52 to the bed 48. I

A common prime mover for driving both the draw slide 38 and the pressbed 48 includes a motor 62 carried by a bracket 64 pivotally secured bya pin 66 to the press frame. Motor 62 drives V-belts 68 to drive theflywheel 70' of the press. As can be seen in Figure 2, a clutch carriedin a housing 72 is adapted to engage flywheel 70 with a drive shaft 74when the press operates. We rotatably mount shaft 74 in respectivebearings 76 and 78 carried by the press frame. A brake carried in ahousing 80 restrains shaft 74 from rotation when flywheel 70 isdisengaged from the shaft. Shaft 74 carries for rotation therewith apinion 82 which engages and drives a gear 84 fixed for rotation with ashaft 86 rotatably mounted on the press frame. Shaft 86 carries forrotation with it a pinion 88 which drives an eccentric gear 98 formedwith a hub 92 mounted on a shaft 94 for rotation therewith. Shaft 94mounts for rotation with it the eccentric member 96 of an eccentricstrap 98. Member 96 may conveniently be formed as an integral portion ofhub 92, as shown in Figure 2. A pin 101) pivotally connects one arm of alever 182 with eccentric strap 98. 'Wepivotally mount ofiset lever 162at its center on a shaft 104 fixed on the machine frame.

A pin 186 pivotally connects the end of lever 182 remote from pin 1% toa link 108. A pin 110 connects link 168 to a rocker arm 112 carried by abushing 114 in its lowermost position in the drawings.

We provide a second linkage identical with the linkage This linkageincludes an arm 124 carried by a bushing 126 on a fixed "Referring againto'Figure 1, eccentric gear '90 also provides the drive forreciprocating the inner-slide of the press. Shaft 94 carries forrotation therewith the eccentric 136 of an eccentric strap or pitman138. Becentric 136 may conveniently be formed integrally with hub 92, asshown in Figure 2. A pin 140 pivotally connects eccentric strap 138 witha rocker arm 142 carried by a rocker shaft 144 rotatably supported onthe press frame. As can best be seen by reference to Figure 4, we formarm 142 with a hub 146 rotatably mounted by a bushing 148 on shaft 144.A recess 150 in hub 146 slidably mounts a clutch member 152. bearingbetween the member 152 and the bottom of a bore 156 in an arm, to bedescribed hereinafter, normally urges clutch member 152 into engagementwith arm 142. A spline or the like 158 on shaft 144 slidably mountsmember 152 on shaft 144 for rotation therewith. It will be seen thatwhen member 152 engages arm 142 under the influence of spring 154, arm142is clutched to shaft 144. A key 162 mounts a crank on shaft 144 forrotation therewith. When arm 142 is clutched to shaft 144 it drivescrank 160. Clutch member 152 provides a means for disengaging arm 142from shaft 144 so that the radial angle between crank 142 and the crank160 may be adjusted. This adjustment varies the stroke of slide 3 8. Apin 166 pivotally connects crank 160 with a draw slide operating link164. We provide the hub 146 of arm 142 with a bore 168 to admit fluidunder pressure to the interior of hub 146 to move clutch memher 152 tothe right as viewed in Figure 4 against the action of spring 154 todisengage crank arm 142 from shaft 144. it will-be appreciated from thestructure just described that pitman 138 drives crank 142 to drive shaft144 and crank arm 160 to drive link 164 and thus reciprocate slide 38.

As can be seen by reference to Figures 1 and 3, link 164 is associatedwith the left hand side of the press. We provide a drive means similarto the drive for link 164 for draw slide link 170 associated with therighthand side of the machine as viewed in Figure 1. This drive meansincludes an eccentric actuated pitman 172 pivotally connected by a pin174 to a crank arm 176 arranged to be clutched to a shaft 178, rotatablymounted on the machine frame, in the same manner as crank arm 142 isarranged to be clutched to shaft 144. A crank arm mounted on shaft 178for rotation therewith connects shaft 178 with link 170 by a pin 182-.We provide an eccentric gear 181' similar to the gear 90 for drivingpitman 172. The eccentric gear 181 is driven in a direction opposite tothe direction in which eccentric gear 90 is driven. To accomplish thiswe mount a gear 175 on a shaft 177 for rotation therewith. Gear 84,which is driven by pinion 82, drives gear 175. Shaft 177 carries forrotation with it a pinion 179 for driving the eccentric gear 181associated with pitman 172. It will be appreciated that gears 84 and 175rotate oppositely with the result that links 164 and 170 have a similarmovement to reciprocate inner slide 38.

Each of the links 164 and 170 is connected by a pivot pin 184 to a block186 carried by one end of a threaded rod 188. The end of each of therods 188 remote from a block 186 threadably engages an adjusting nut 190disposed in a housing 192 fixed to the inner slide 38. We provide eachof the housings 192 with a worm (not shown) for driving the associatednut 19!) to move the inner slide up or down with respect to the pressframe. We provide a drive motor 194 for driving shafts 196 to drive theadjusting nut worms associated with nuts 190.

In operation of our reciprocating bed press, bed 48 first moves upwardlyand clamps a piece of work fed to the press between itself and blankholder 12. When this has been accomplished, the bed drive linkagepermits the bed to dwell while inner slide '38 makes its working stroke.After an operation has been performed, slideSS is withdrawn and the bedreturns to its initial position.

Suitable means known to the art (not shown) moves rtho A spring 154 E Ufinished piece of work away from the press. These operations willreadilybe seen from an examination of Figure 5. In Figure 7 we have shown theoperation of our inner slide drive and bed drive linkages for the leftside of our press, as viewed in Figure 1. We have indicated the axes ofthe various shafts and pivots in first corresponding limit positions bythe same reference numerals as are employed in Figures 1 to 4. Thepositions of the axes at the other respective limit positions have beenindicated by primed reference characters. We have indicated theconnecting links and levers by solid lines in the first correspondinglimit positions and by broken lines in the second corresponding limitpositions. The paths of movement of various pivots are shown in dot-dashlines.

The solid line in Figure 6 indicates the path of movemnet of the pressbed, while the broken line indicates the path of movement of the pressdraw slide. As can be seen by reference to Figures to 7, from an initialposition in which the bed occupies its lowermost position and the drawslide occupies its uppermost position, the bed first moves up to clamp awork sheet to the press blank holder. This action occurs inapproximately the first 90 of a work cycle during which time the drawslide dwells. After the bed arrives at its uppermost or clampingposition, it dwells for a period of time necessary to accomplish adrawing operation. In one embodiment of our invention this dwell periodoccupies approximately 135 of the work cycle. The drive linkages arearranged to give the required draw slide and bed strokes. As shown inFigure 7, we may, for example, provide a twenty-one inch bed stroke andan eight and one-half inch Cll'SlW slide stroke. During the period oftime when the bed dwells, the draw slide linkage operates the draw slideto perform a drawing operation on the work. When the drawing operationis complete, the draw slide moves away from the work while the bedreturns to its initial or lowermost position on the press frame. Whenboth the bed and the draw slide have returned to their initialpositions, the completed work is removed from the press by conventionalmeans known to the art and a new work sheet is fed to the press. This isthe last operation indicated in Figure 5. While we have shown one pathof motion for the press draw slide in Figure 6, it will readily beappreciated that we may adjust the length of the draw with convenientlimits.

It will be seen that we have accomplished the objects of our invention.We have provided a high speed reciprocating bed press which may be usedin an integrated production line wherein operations are performed inphase. Cur press permits full advantage to be taken of the productionline capacity with a resulting increase in production and decrease inlabor costs. The high speed drawing operation in our press starts at acomparatively -low speed. We achieve high speed operation in our presswithout the necessity of reciprocating a heavy crown. Our press operatesat high speed without employing the inefficient inverted draw used insome presses of the prior art. In our press foreign matter will not fallby gravity into the die carried by the press draw slide. The draw slideof our press engages the concave side of a piece of work to perform thedrawing operation efliciently.

It will be understood that certain features and subcombinations are ofutility and may be employed without reference to other features andsubcombinations. This is contemplated by and is within the scope of ourclaims. It is further obvious that various changes may be made in 6details within the scope of our claims without departing from the spiritof our invention. It is, therefore, to be understood that our inventionis not to be limited to the specific details shown and described. Havingthus described our invention, what we claim is:

l. A power press including in combination a frame, a blank holder, meansmounting said blank holder on said frame, a draw slide, means mountingsaid draw slide on said frame for reciprocation with respect thereto, abed, means mounting said bed on said frame for reciprocation withrespect thereto, a rocker shaft carried by the frame, a first crank, adrive link connecting said first crank to said draw slide, a secondcrank, means mounting said first and second cranks on said rocker shaftfor rotation therewith, said mounting means including means foradjusting the relative radial positions of said first and second crankson said rocker shaft, means for actuating said second crank toreciprocate said draw slide, drive means for reciprocating said bed, acommon prime mover including a motor for said crank actuating means andfor said drive means and means for mounting said motor below said bed.

2. A power press including in combination a frame, a blank holder, meansmounting said blank holder on said frame, a draw slide, means mountingsaid draw slide on said frame for reciprocation with respect thereto, abed, means mounting said bed on said frame for reciprocation withrespect thereto, 'a rocker shaft carried by the frame, a first crank,means mounting said firstcrank on said rocker shaft for rotationtherewith, a drive link connecting said first crank to said draw slide,a second crank, means rotatably mounting said second crank on saidrocker shaft, a releasable clutch normally connecting said second crankto said rocker shaft for rotation therewith, said clutch being adaptedto be actuated to permit adjustment of the relative radial positions ofsaid cranks on said rocker shaft, means for actuating said second crankto reciprocate said draw slide, drive means for reciprocating said bed,a common prime mover including a motor for said second crank actuatingmeans and for said drive means and means for mounting said motor belowsaid bed.

3. A power press as in claim 2 in which said means mounting said secondcrank on said rocker shaft includes a bushing and in which said clutchincludes a plate, means mounting said plate on said shaft for rotationtherewith and for movement along the shaft and means for urging saidplate into engagement with said crank.

References Cited in the file of this patent UNITED STATES PATENTS848,380 Lake Mar. 26, 1907 883,813 Lange Apr. 7, 1908 1,749,545 PierceMar. 4, 1930 2,085,799 Glasner July 6, 1937 2,120,356 Glasner June 14,1938 2,257,383 Johansen Sept. 30, 1941 2,338,352 Paque Jan. 4, 19442,522,746 Byerlein Sept. 19, 1950 2,550,062 Glasner Apr. 24, 19512,550,063 Johansen Apr. 24, 1951 2,550,064 Ward Apr. 24, 1951 2,627,758Wales Feb. 10, 1953 2,643,625 Reimer June 30, 1953 2,684,742 Eason July27, 1954 2,688,296 Danly et al Sept. 7, 1954

